Measuring apparatus.



w. H. BRISTOL. MEASURING APPARATUS.

APPLICATI ON FILED JUNE 22. I911.

" 1,263,308. Patented Apr. 16, 191&

I O go 00 J] t :1 .24 27 30 mvmrol BC: 21% a W wm 1 A, 2 wa e .m (I i ATTORNE Y WILLIAM H. BRISTOL, OF WATEBBUBY, CONN EQTIGUT.

MEASURING APPARATUS.

Specification of Letters Patent.

Patented Apr. 16, 1918.

Application filed June 22, 1917. Serial No. 176,282.

To all whom it may concern:

Be it known that I, WILLIAM H. BRISTOL, a citizen of the United States,and a resident of Waterbury, in the county of New Haven and State ofConnecticut, have invented'certain new and useful Improvements inMeasuring Apparatus, of which the following 1s a specification.

The invention relates to improvements in measuring apparatus, morearticularly to a measuring device provide with a single pointer or armdesigned to operate over a chart or dial to produce a multiplicity ofrecords of separate and distinct operations or physical or otherconditions and changes. In multiple record instruments of thischaracter, it has been difiicult to individualize the difi'erent recordsor indications of the measuring pointer or arm which is arranged to beintermittently and successively actuated for each of the correspondingcontrolling conditions.

It is the object of the present invention to so restrict or localize theaction of said measurin arm or pointer that the same will operate o eachparticular condition over the entire length or revolution of the chart(temperature line) but over a particular predetermined portion onl mgarc, corresponding to t e working range or active measuring positlon.

A further object of the invention is to provide means whereby themovement of the arm or pointer may be adjusted to be suitable foroperation over its original predetermined restricted radial portion ormeasuring arc of the chart, even though the controllm conditioncorresponding thereto be altere from the normal.

The nature of the invention will be best understood when described inconnection the electrical connections.

imilarcharacters of reference designate correspondingparts throughoutthe several views; H

Referring to the drawmgsy10 designates a suitable casing contaimng ameasuring 1nof the measurstrument, for example, an electrically actuatedmovement 11 of any well-known or special construction, operating an armor pointer 12 which may,-if*des1red, effect a record of the indicationsupon a suitable chart, for example a rotatable chart 13, in wellknownmanner, and for all of which no claim is made per se. The instrument 11is designed to be connected with the devices affected by the o erationsor conditions to be measured. or example, it may be connected with aplurality of thermoelectric couples 14, 15 and 16 located at variouspoints and adapted to measure the temperatures of furnaces 17 18 and 19,designated as stations A, B and C.

Under ordinary conditions, while each thermo-electric couple wouldproperly actuate the arm 12 and provide a record of the temperature onchart 13, the various records thus made would be found, generally, toconflict and would be diflicult to dilferentiate and read accurately. Infact, various expedients have been heretofore roposed to obviate thedifficulty of separatlng the individual records thus made, for example,diflerent characteristic markings have been made by the ointer tocorrespond with the changes at tiie difierent stations involved; or, thedifi'erent records have been made over various portions of the length ofthe chart or in different sectors thereof.

In accordance with the present invention, however, the actual localityof operation of the arm is restricted or individualized on the chartover the measuring arc; whereas, formerly, each of the thermo-electriccouples would have efi'ected a record of a particular temperature alongthe same temperature line of the chart for a given temperature. This isaccomplished b inserting in each of the circuits 20, 21 an 22, leadingfrom a thermo-electric couple to the measuring instrument, a suitableresistance 23, 24 and 25 (Fig. 3), whereby the indications of themeasuring arm 12 will be localized and restricted to a articularpredetermined portion ofthe cl iart 13 for a given predetermined range.For example, assuming that the device were adapted for the measurementof temperatures of 1000 0., for stations A and B, and 1500 C. forstation C with a reasonable variation either side, the one circuit 22for the outermost record or that of station C will contain apredetermined resistance to suit the particular position, the circuit 21for the intermediate record, another resistance, and the c1rcu1t for theinnermost record, a still further resistance. Therefore, though eachthermoelectric couple of stations A and B be exposed successively to thesame temperature, to-wit1000 (l, and the station C to 1500 C., thecorresponding positions of arml2 ples in succession, being retained inone po partlcular .sition of action for a sufliciently long periodoftime in each case to make a distinct and intelligible record 24. Therecords may be further difierentiated as hereinafter set forth. The armis moved to a new position after each of the successive records; and theinterval between the markings corresponding to a particularthermo-electric couple thus localized is not so great as to renderthereoord unsatisfactory.

To accomplish this change from one thermo couple to the other, anysuitable and well-known contact device, as the device 26, driven byclock mechanism or otherwise, may be employed; and the same is providedwith a plurality of contacts 27, 28 and 29 corresponding to the numberof individualized records desired. These revolving contacts areconnected respectively with a lead 20, 21 and 22 of each of thethermo-electric couples, the other leads therefrom being all connectedto one poleof the measuring instrument 11, while the other pole of saidin-' strument is connected to a brush 30 which bears successively uponrthe contact segments 27', 28 and 29 as-the same are presented thereto,thus completing the circuit from a thermo-electric couple, and throughthe corresponding resistance thereof whlch localizes the record made.ore- ,over, gy making the segments 27, .28 and 29 of di erent length,the characteristics of the records may be correspondingly altered (seeFig.

It may found desirable, furthermore,

I to employ the same couple already installed a 1 those for'which theapparatus'has been ad-- for measurm temperatures different from ju'stedand record localized. For example, the temperature of a furnace atstations A or Bmight be raised to 1500 C. or at-sta tion C to 2000. C.;and in order to maintain the record for such temperature at thepreviously localized position on'the chart, ad ustable resistances 31,32 and 33 are arranged to be cut into the corresponding circuits. Inthis manner, the decreased poswitches 34, 35 and 36 are providedpreferabl at the measuring instrument casing 10.

claim:

1. An electrical measuring instrument having a single measuring arm; aplurality of actuating members adapted to be connected with saidinstrument; and resistances adapted to be connected in circuit with saidactuating members for. the purpose of localizing and individualizing theplurality of measurements made by the said arm through theinstrumentality members.

2. An electrical measuring instrument having a single recording1 arm; aplurality of actuating members a apted to be connected with saidinstrument; and resistances adapted to be connected in circuit with saidactuating members for the urpose of localizing and individualizing t eplurality of records made by the said arm through the fistrumentalityofv the said actuating mem- 3. An electric measuring instrument having asingle recording arm; a plurality of actuating members adapted to beconnected with said instrument; a pluralit of resistances adapted to beautomatical y and successively connected in circuit with said actuatingmembers forthe purpose .of localizing and individualizing the pluralityof records made by the said arm through the instrumentality of the saidactuating members. v

4. An electrical measuring 'instrument having a single recording arm; aplurality of actuating-members adapted to be connected with saidinstrument; a lurality of resistances; and means to perio ically connecta partlcular actuating member to said measurmg instrument andsimultaneously therewith include a predetermined resistance.

5. An electrical measuring instrument hav ing a single recordingarin; aplurality of actuating members adapted to be connected with saidinstrument; a plurality of resistances; and means to periodicallyconnect a particular actuating member to said measuring instrument andsimultaneously therewith include a. redetermined resistance, eachresistance bemg of a difl'erent value.

6. An electrical'measuring instrument having asingle recordin arm; aplurality of actuating members a, apted to. be connected of the saidactuating with said instrument; a plurality of resista said actuatingmembers-to said measuring Instrument and simultaneously therewithinclude a resistance.

.ances; and means to successively connect 7. An electrical measuringinstrument having a single measuring arm; a plurality of actuatingmembers adapted to be connected with said instrument; resistancesadapted ances adapted individually to be connected in circuit with saidfirst-named resistances and with said measuring instrument.

8. An electrical recording instrument .having a single recording arm; aplurality of actuating members; a rotatable contact device adapted tosuccessively connect said actuating members to said measuringinstrument; and resistances adapted to be included in circuit with eachof said actuating members through the instrumentality of said contactdevice to localize and individualize the respective records made by saidrecording arm.

9. An electrical recording instrument having a single recording arm; aplurality of actuating members; a rotatable contact de vice adapted tosuccessively connect said actuating members to said measuringinstrument; resistances adapted to be included in circuit with each ofsaid actuating member through the instrumentality of said contact deviceto localize and individualize the respective records made by saidrecording arm; and means to include additional resistance in a circuitof an actuating member.

10. An electrical recording instrument having a single recording arm; aplurality of thermo electric couples; a rotatable contact device adaptedto successively connect said thermo electric couples to said measuringinstrument; and resistances adapted to be included in circuit with eachof said thermo electric couples through the instrumentality of saidcontact device to localize and individualize the respective records madeby said recording arm.

11. An electrical recording instrument having a single recording arm; aplurality of actuating members; a rotatable contact device, having aplurality of contact segments of difi'erent length, adapted tosuccessively connect said actuating members to said measuringinstrument; and resistances adapted to be included in circuit with eachof said actuating members through the instrumentality of said contactdevice to localize and individualize the respective records made by saidrecording arm. I

Signed at New York, in the county of New York and State of New York,this 19th day of June, A. D. 1917.

WILLIAM H. BRISTOL.

